In 1929 he received a B.S. from Emmanuel Missionary College, and began teaching science and math at Hinsdale Academy. He then taught for 15 years at Union College, Lincoln, NE where became the chairman of the biology department. In 1940, he received a Ph.D. in plant ecology from University of Nebraska. His thesis “Water content and osmotic pressure of certain prairie plants in relation to environment” is available in the UNL library.

In his book Fundamental Biology (self-published, 1941) Marsh coined the term Baramin in reference to the Biblical kind, and developed the theory that baramin are defined by ability to hybridize. He also argued that modern human races are degenerate forms of first created man and warned that the living world is the scene of a cosmic struggle between the Creator and Satan. In 1944, he published a book, “Evolution, Creation and Science”, after which he wrote dozens of books supporting creation.

In 1950 he became a professor of biology at Emmanuel Missionary College (later known as Andrews University – Berrien Springs, MI [3]) where he received his undergraduate degree. Marsh Hall on the Andrews campus was named in honor of Frank Marsh and his Wife Alice who were both faculty members. In 1976, he published “Variation and fixity in nature” where he insisted that all of the evidence for evolution only demonstrates microevolution. He claimed that the most basic and well-demonstrated of biological principles is that of limitation of variation.